Non-U souvenir, funny variant (7)
I believe the answer is:
version
'variant' is the definition.
(I know that variant can be written as version)
'non-u souvenir funny' is the wordplay.
'non' indicates named letters should be taken away.
'funny' indicates anagramming the letters.
'souvenir' with 'u' taken out is 'sovenir'.
'sovenir' is an anagram of 'VERSION'.
(Other definitions for version that I've seen before include "Rendering" , "See 24" , "Rendition" , "Model" , "Sort" .)